Removed stray declared method.

Left-over from the removal of diffNeedsRecompositeLayer [1].

[1] https://codereview.chromium.org/360103008

R=abarth@chromium.org

Review URL: https://codereview.chromium.org/565583002

git-svn-id: svn://svn.chromium.org/blink/trunk@181801 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/core/rendering/style/RenderStyle.h

@@ -1815,7 +1815,6 @@ private:
     bool diffNeedsFullLayout(const RenderStyle& other) const;
     bool diffNeedsPaintInvalidationLayer(const RenderStyle& other) const;
     bool diffNeedsPaintInvalidationObject(const RenderStyle& other) const;
-    bool diffNeedsRecompositeLayer(const RenderStyle& other) const;
     void updatePropertySpecificDifferences(const RenderStyle& other, StyleDifference&) const;
 };